I have had my 600 for 6 months. It has been perfect until today when it took over its own control. It sputters, keeps attempting to create phone numbers (although not dialing). I cannot direct it to do anything even after reseting from the back. There is a small black square pulsating in the lower right corner of the screen. It is currently useless-----any thoughts? Thanks,

Just a naive suggestion: try to carefully clean the rim of the touchscreen, especially the part between the case and screen itself. This worked for me some time ago (likely dust static charge was making crazy the digitizer). Hope this can help! Good luck. Francesco

I've had my treo for about 11 months. Two weeks ago the regular spkr stopped workin, two days later the car charger suddenly stopped working and finally the very next day a yellowish spot appeared on the screen. Currently awaiting warranty replacement fm P1. Good luck.

An update: Now it is not sputtering......When I push either the left or right button it comes on as if it will work, but it does nothing when I press the center button except turn off after a couple of seconds. Does it sound like time to visit Verizon with my warranty?

I have had my 600 for 6 months. It has been perfect until today when it took over its own control. It sputters, keeps attempting to create phone numbers (although not dialing). I cannot direct it to do anything even after reseting from the back. There is a small black square pulsating in the lower right corner of the screen. It is currently useless-----any thoughts? Thanks,

I believe the mystery is solved. I cleaned the screen this morning with Windex and I believe a little too much at that. When it apparently had dried out and I reset the 600, it works fine.......Thank you for your help. The sand and cleaning the screen comments put me on the right trail.